c++ - Copy std::vector into std::array

Question

How do I copy or move the first n elements of a std::vector<T> into a C++11 std::array<T, n>?

Answer 1

Use std::copy_n

std::array<T, N> arr;
std::copy_n(vec.begin(), N, arr.begin());

Edit: I didn't notice that you'd asked about moving the elements as well. To move, wrap the source iterator in std::move_iterator.

std::copy_n(std::make_move_iterator(v.begin()), N, arr.begin());